MdePkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / Mwait.c

/** @file\r
  AsmMwait function\r
\r
  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
/**\r
  Executes an MWAIT instruction.\r
\r
  Executes an MWAIT instruction with the register state specified by Eax and\r
  Ecx. Returns Eax. This function is only available on IA-32 and x64.\r
\r
  @param  RegisterEax The value to load into EAX or RAX before executing the MONITOR\r
                      instruction.\r
  @param  RegisterEcx The value to load into ECX or RCX before executing the MONITOR\r
                      instruction.\r
\r
  @return RegisterEax\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmMwait (\r
  IN      UINTN                     RegisterEax,\r
  IN      UINTN                     RegisterEcx\r
  )\r
{\r
  _asm {\r
    mov     eax, RegisterEax\r
    mov     ecx, RegisterEcx\r
    _emit   0x0f              // mwait\r
    _emit   0x01\r
    _emit   0xC9\r
  }\r
}\r
\r